360w chipped b grade sun power solar panels vs 340w A grade ones. Price is same

rollandelliottrollandelliott Solar Expert Posts: 834 ✭✭
suntan solar, reputable company, is offering 340w a grade OR 360W b grade solar panels for same price of $110 no warranty made by sunpower. These are commercial solar panels with 6 rows of cells wired so each row is separate. So a chipped cell would only lower output in that specific row I think. company sent me sample photo of what a chipped cell might look like (just example, not actual panel)
 I am leaning toward the B grade 360w cells unless someone suggests otherwise. San Tan claims no drop in power output, but they really dont' back up the panels with a warranty either. 


  • mike95490mike95490 Solar Expert Posts: 8,612 ✭✭✭✭✭
    Chipped cells as you show, develop micro cracks along the edge and those invisibly spread into the body of the cell over time, causing degradation.  Think of it as a 5 year panel.

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  • rollandelliottrollandelliott Solar Expert Posts: 834 ✭✭
    well it would only save $220 going with the B grade panels, so I'm getting the A grade, thanks. 
  • mcgivormcgivor Solar Expert Posts: 3,274 ✭✭✭✭✭
    well it would only save $220 going with the B grade panels, so I'm getting the A grade, thanks. 
    Probably a wise decision, the margin simply isn't there, 30-50% would be worth thinking about,
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 
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